Boat hoist



E. B. THOMPSON June 27, 1944.

BOAT HOI ST Filed Aug. 29, 1941 Patented June 27, 1944 BOAT Hois'r 1 Elmer B. Thompson, Des Moines', low a,a s s igno'r i to Globe Hoist Company, 'De's*Moines," Io wa,;a

corporation of Iowa qdpplication August 29,1941,;s ng1nd osj J (c1.' 254 -'1e"1') 1 Claim.

It is the almost universal practice to permit power operated or speed boats to remain in the water for an entire season, either in floating boat-houses or tied to decks. It is well known that the paint or varnish on said boats is notimpervious to water and that even with small boats several hundred pounds of water will be absorbed by the wooden hull of a boat and cause the boat to be waterlogged and, hence, impaired in its speed. Furthermore, the wave action upon the boat is frequently injurious.

The object of my invention is to provide a boat hoist to which a boat may be attached and hoisted out of the water to a point above the waves, with as little or no effort on the part of the operator than is ordinarily applied when tying a boat to a dock.

A further object is to provide a boat hoist which comprises a single unit of compact form and small size which may be stored in a small space, conveniently and cheaply shipped and handled, and readily and easily installed in a boathouse by unskilled workmen, and to provide a boat hoist cheap enough to be purchased and installed by the average power boat owner.

A further object is to provide a boat hoist unit which may be readily and quickly adapted for boats of varying lengths.

A further object is to provide a boat hoist in which the boat lifting chains are positively held in contact with their power operated pocket wheels against accidental displacement from the wheelsfor avoiding accidents and promoting safety in raising or lowering a boat.

A further object is to provide simple and easily operated means for holding the boat lifting chains in position relative to the power operated pocket wheels and so that a lock may be readily and easily applied for preventing unauthorized persons from lowering the boat.

In the accompanying drawing- Figure 1 shows a side elevation of my improved boathoist and a boat supported in raised position thereby;

Figure 2 shows an end elevation of the boat hoist unit applied to a supporting beam;

Figure 3 shows a side elevation of same;

Figure 4 shows a bottom view of same;

Figure 5 shows a longitudinal sectional view of the pocket wheel and chain guard assembly;

Figure 6 shows a sectional view on the line 5--6 of Fig. 5; and

Figure 7 shows a detail sectional view on the line 1-1 of Fig. 2' of the speed reducing mechanism applied to the motor shaft.

My improved boat hoist comprises a small compact unit adapted to be bolted to an elevated support such as a beam Hi. It comprises a housing II in which is mounted a shaft [2 having fixed thereto a large worm gear wheel I3 and a small pinion I4 which is geared to a pinion IE on the shaft l6 which is also mounted in the housing I I, as shown in Fig. 'I.

An electric motor I! is mounted at the top of the housing H, and its shaft has a worm gear I8 in mesh with the worm gear wheel [3.

A second housing member 19 is bolted to the housing H and the shaft I6 is projected centrally into the housing member l9, as shown in Figs. 5 and 6. This member I9 is substantially cylindrical in shape and is enclosed on all sides except for a chain opening at 20, see Fig. 6. Within the housing I9 is a cylindrical pocket wheel member fixed to the shaft l6 and formed with two sets of pocket wheel depressions 2| and 22. The interior of the housing It is formed with coacting depressions at 23 and 24!, see Fig. 5.

Two chains of oval links with the alternate links at right angles to each other are extended through the opening 20 and partially around the pocket wheels and out of the housing, as shown in Fig. 6. These chains 26 and 21 are provided at one end with hooks 28 and 29.

For the purpose of looking a boat in the elevated position I have provided on the side of the housing I9 opposite from the opening 20 a rib 3!! having a slot 3| of a size to freely admit a link of each of the chains 26 and 2'! wheninserted with their flat sides parallel with the slot, as

very simple and easily and quickly performed.

It is only necessary to bolt the housing unit 9 to an elevated support, such as the beam H). The boat 36 is usually provided with eye bolts 31 at its bow and stern. The hook 29 on the short chain is placed in the eye bolt at the bow of the boat when the boat is floating, then the other chain is extended to position for engaging the eye bolt at the stern of the boat. Pulleys 38 and 39 are placed in position over the: eye bolts and the chains are extended over said pulleys. The chains are finally extended through and beyond the pocket wheel and its housing, and the ends thereof are supported in an elevated position, as shown in Fig. 1. I

In practice, the operator simply places the hooks 28 and-29in the eye bolts on the boat and starts the motor. The chains must movewith equal speed because both are passing around the pocket wheels, which are formed integral. During this elevating movement the chains cannot he accidentally removed from the pocket wheels because they are held to the pocket wheels by ,the housing l9. When the boathas been elevated to the desired distance the motor is stopped, the worm gear l8 locks it in this position, then the operator grasps the slack ends of the chains and places them in the slot 3| and applies the padlock about said Wheel in said chain receiving recess, the periphery of said housing having an annular recess opposite the chain receiving recess in said wheel to form a guide way for said chain, and means on the outer periphery of said housing for locking said chain against movement including a portion having a chain receiving slot therein.

ELMER B. THOMPSON. 

